Horseshoe-calk.



G. E'. LINDBBRG.

HORSESBOE GALK.'

yM PLIOAIION FILED JULY 23,1908.

Patented Dec. 1, 1908. f

"Ill H1:

UNITED STATES P'AgnNT ornion.

GEORGE E. LINDBERG, OI DULUTH, MINNESOTA.

' -HoRsEsHoE-CALK.

Specification of Letters Patent.

Application filed ,JulyV 23,

Patented Dec. 1, 1908` 1908. `Serial No. 445,512.

Tooll whom 'it may concern:-

Be it known Athat I, GEORGE E. LINDBERG, a citizen of the United States, residing at Duluth, in the county of St. Louis and State of Minnesota, have invented certain new and luseful Improvements in I IIorseshoe-Calks;

and I `do declare the following to be a full, clear,A and exact description of the invention, suchl as will enable others skilled in the art to which it appertains to make and use the sam'e.A

This invention relates to new and useful improvements in horseshoe calks, `and has for its-object to provide a calk which will provide a'` cutting edge until practically worn, and which will reduce the danger of a horse from slipping'on icy or slippery roads and which will not become caught bet-ween the planks on a'planked road, rail.

road crossing or the like. l

With these and otherobjects in View; the

invention consists of certain novel features of construction,,combination and arrange-` ment of parts, as will be more fully described 'and particularly pointed out in the appended claim. y

In the accompanying drawings, Figure 1 is a side elevation of a horseshoe calk illustrating the application of the invention; Fig.2 is a reverse plan View; Fig'. 3 is a detail perspective view of one of the calks on an enlarged scale; and Fig. 4 is a similar view. of a slightly modified form of the calk.

In the embodiment illustrated the calk comprises an approximately cylindrical shank 1 provided with Aone or more circumy ferentially spaced longitudinally -extending tongues 2 provided with sliar ened cutting edges.4 By making the calko crucible steel it 1s not necessary to provide grooves in' the shank receiving socket of the horseshoe as the shoe being made of a softer metal such as iron 'or soft steel,l the tongues 2v will cut their way into the wall of said socket. It ,will thus be seen that after the shank of the calk' has been inserted in position liability of the calk turning is entirely obViated, which is not true when the shank of the calk is screwed into 4position or set screws or the like are relied upon as a fastening means for the calk shank. The calk also comprises a thin metal spur 4' rovided with a fiat.

vfront face 5, the'inner ace of the spur being beveled to provide a sharpened cutting edge l 6 at the lower end of the spur. The calk is l also provided at its rear face with a central reinforcing rib or web 7 which extends from the lower end of the shank to the lower end of the spur, the outer edge of the web being beveled at a suitable inclination toward the rear face of the spur. By providing the calk with a central reinforcing rib such as I have shownand described, the spur may be made very thin without danger of its breaking or bending and the spur being of very thin metal a cutting surface will be provided to penetrate into the ground or other surface until the spur has been practically worn out.

In thevarious forms of calks now in use no reinforcing web being provided it is necessary -to make the spur rather thick to provide the requisite strength and for this the spur .must necessarilyl be sharpened or into the ground or other surface.

In the modified formpof spur shown in Fig. 4 the reinforcing web is provided with a straight outer edge 8 which extends in a plane flush with the shank portion of the calk, or in other words, the web is of `approximately rectangular oblong form. This and rough country, where the roads are 1rregular and much danger is experienced in the horse vslipping side-wise. These reinforcing webs also prevent the spurs from entering between two planks `on planked roads, which-frequently results in tripping the ani mals, with severeinjury in many instances.

From the foregoing description, taken in ings, the construction and operation of the invention will be readily understood without requiring a more extended explanation.

Various changes in the form, proportion and the minor details of construction may be resorted to without departing from the principle or sacrificing any of the advantages of thisl invention as defined in the appended claim.

Having thus describedand ascertained the nature of my invention, what I claim as new and desire to secure by Letters-Patent, 1s:-

A calk of the class described comprising flat spur located at` the base near the front dispensed with as the spur is to'o thick to cutY reason as soon as the cutting `edge is worn,

form of calk isespecially adapted for hilly connection with the accompanying drawan approximately cylindrical shank, and a side ofthe shank and extending transversely my hand in presence of two subscribing wit- Bf 1nfd beyfong opposte sides terdeof, he nesses.

ac ace o t e spur eingv provi e Wit 4. a I central vertical approximately triangula-lly'f GEORGE E' L-INDBERG' 5 shaped reinforcing web disposed with its Witnesses: hypotenuse at the. rear. H. H. TALBoYs, lIn testimony whereof I have hereunto set S. A. FEssMAN. 

